[RFC V3 PATCH 3/6] selftests: kvm: ucall: Allow querying ucall pool gpa

[Vishal Annapurve <vannapurve@google.com>]

Add a helper to query guest physical address for ucall pool
so that guest can mark the page as accessed shared or private.

Signed-off-by: Vishal Annapurve <vannapurve@google.com>
---
 tools/testing/selftests/kvm/include/ucall_common.h |  2 ++
 tools/testing/selftests/kvm/lib/ucall_common.c     | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/ucall_common.h b/tools/testing/selftests/kvm/include/ucall_common.h
index 279bbab011c7..2c6e5c4df012 100644
--- a/tools/testing/selftests/kvm/include/ucall_common.h
+++ b/tools/testing/selftests/kvm/include/ucall_common.h
@@ -31,6 +31,8 @@ void ucall_arch_uninit(struct kvm_vm *vm);
 void ucall_arch_do_ucall(vm_vaddr_t uc);
 void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu);
 
+vm_paddr_t get_ucall_pool_paddr(void);
+
 void ucall(uint64_t cmd, int nargs, ...);
 uint64_t get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc);
 
diff --git a/tools/testing/selftests/kvm/lib/ucall_common.c b/tools/testing/selftests/kvm/lib/ucall_common.c
index 5a15fa39cd51..4d2abef8ee77 100644
--- a/tools/testing/selftests/kvm/lib/ucall_common.c
+++ b/tools/testing/selftests/kvm/lib/ucall_common.c
@@ -11,6 +11,7 @@ struct ucall_header {
 
 static bool use_ucall_pool;
 static struct ucall_header *ucall_pool;
+static vm_paddr_t ucall_page_paddr;
 
 void ucall_init(struct kvm_vm *vm, void *arg)
 {
@@ -35,7 +36,10 @@ void ucall_init(struct kvm_vm *vm, void *arg)
 	}
 
 	ucall_pool = (struct ucall_header *)vaddr;
+	ucall_page_paddr = addr_gva2gpa(vm, vaddr);
 	sync_global_to_guest(vm, ucall_pool);
+	sync_global_to_guest(vm, ucall_page_paddr);
+	printf("ucall_page_paddr 0x%lx\n", ucall_page_paddr);
 
 out:
 	ucall_arch_init(vm, arg);
@@ -54,6 +58,14 @@ void ucall_uninit(struct kvm_vm *vm)
 	ucall_arch_uninit(vm);
 }
 
+vm_paddr_t get_ucall_pool_paddr(void)
+{
+	if (!use_ucall_pool)
+		return 0;
+
+	return ucall_page_paddr;
+}
+
 static struct ucall *ucall_alloc(void)
 {
 	struct ucall *uc = NULL;
-- 
2.37.1.595.g718a3a8f04-goog